The average weekly number of toy trains produced by Factory J and K is 3774. The average weekly number of toy trains produced by Factory J and L is 6273. If Factory K produced ²₉ as many toy trains as Factory L each week, how many toy trains does Factory J produce weekly?
Total toy trains that Factory J and Factory K produced
= 3774 x 2
= 7548

Total toy trains that Factory J and Factory L produced
= 6273 x 2
= 12546

Number of toy trains produced by Factory K = 2 u
Number of toy trains produced by Factory L = 9 u

Factory J's toys + 2 u = 7548 --- (1)
Factory J's toys + 9 u = 12546 --- (2)

(2) - (1)
9 u - 2 u = 12546 - 7548
7 u = 4998
1 u = 4998 ÷ 7 = 714

Number of toy trains produced by K
= 2 u
= 2 x 714
= 1428

Number of toy trains produced by J
= 7548 - 1428
= 6120

Answer(s): 6120